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Sizing
Engineering example
Volumetric flow/dial
presetting
Standard flow rate
VPF53.50F16
v ˙
3
[m
/h]
Min.
0.2
0.4
Dial
Δpmin [kPa]
VPF53.65F24
v ˙
3
[m
/h]
Min.
0.2
0.4
Dial
Δpmin [kPa]
VPF53.80F35
v ˙
3
[m
/h]
Min.
0.2
0.4
Dial
Δpmin [kPa]
VPF53.100F70
v ˙
3
[m
/h]
Min.
0.2
0.4
Dial
Δpmin [kPa]
6 / 14
Siemens
Building Technologies
Basis of design
1. Determine heat demand Q [kW]
2. Determine temperature spread ΔT [K]
3. Calculate volumetric flow
Ζ ∴
√
Q
kW
1000
l
V %
<
Ζ ∴
Χ √
. 1
163
T
K
h
4. Select suitable Combi valve VPF53..
5. Determine dial setting using volumetric flow/dial presetting tables, see below.
Example
1. Heat demand
2. Temperature spread
3. Volumetric flow
√
150
kW
1000
%
<
<
V
21
√
. 1
163
6
K
Hint: You can also determine the volumetric flow using the valve slide rule.
4. Select Combi valve VPF53..
Ideally, Combi valves should be selected such that they operate at about 80%
of their maximum flow, enabling them to deliver spare capacity, if required.
Selection:
VPF53.65F24
VPF53.65F35
5. Determine dial setting using volumetric flow/dial presetting tables:
VPF53.65F24
VPF53.65F35
Tables to determine the dial setting for a desired volumetric flow.
Dp min [kPa] based on volumetric flow; interpolate missing values.
Presetting range linear to VDI/VDE 2173
Presetting range linear
Presetting range not permitted
Nominal flow
2.5
3.2
3.8
4.5
5.3
0.6
0.8
1
1.2
1.4
6.5
6.5
6.5
6.8
7.1
4.4
5.6
6.6
7.7
8.6
0.6
0.8
1
1.2
1.4
15.0 15.0
15
15.7 16.2 16.8 17.4 18.0 18.4 18.7 19.1 19.5 20.0 20.9 21.8 22.8 23.9
5.3
6.9
8.3
9.6
10.9 12.2 13.5 14.8 16.2 17.6 19.1 20.7 22.4 24.3 26.4 28.7 31.2
0.6
0.8
1
1.2
1.4
16.0 16.0
16
16.4 16.8 17.2 17.6 18.0 18.4 18.7 19.1 19.6 20.0 20.8 21.7 22.7 23.8
12.1
15
18
21
23
0.6
0.8
1
1.2
1.4
19.0 19.0 20.0 20.5 20.8 21.2 21.7 22.0 22.5 23.2 23.8 24.3 25.0 26.6 28.2 30.2 32.6
Combi valves PN 25 with flanged connections
Q = 150 kW
∆T = 6 K
<
3
'
654
l
/
h
21
6 .
m
/
h
∆p
= 25 kPa
min
∆p
= 55 kPa
min
Volumetric flow
21.6 m
Dial setting
3.6
Volumetric flow
21.6 m
Dial setting
2.7
6
6.8
7.5
8.3
9
1.6
1.8
2
2.2
2.4
7.4
7.7
8.0
8.8
9.6
9.6
10.5 11.5 12.5 13.5 14.7 15.8 17.1 18.5 19.9 21.5 23.2
1.6
1.8
2
2.2
2.4
1.6
1.8
2
2.2
2.4
25
28
30
32
35
1.6
1.8
2
2.2
2.4
3
/h
3
/h
16 m
9.8
10.5 11.3
12
12.8 13.5 14.3
2.6
2.8
3
3.2
3.4
10.4 11.2 12.0 13.5 15.2 16.8 18.5
2.6
2.8
3
3.2
3.4
2.6
2.8
3
3.2
3.4
38
40
43
47
51
2.6
2.8
3
3.2
3.4
CE1N4316en
2018-04-18
3
/h nominal
15
3.6
3.8
4
20
3
24 m
/h nominal
25
3.6
3.8
4
25
3
35 m
/h nominal
34
3.6
3.8
4
25
3
70 m
/h nominal
56
62
68
3.6
3.8
4
35
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